Hole-straighten er



/I/TOHNEYJ.

P. H. MACK. HOLE STRAIGHTBNBR.

(No Model.)

No. 496,316.A

PatenteaApr. z5, 1893.

UNITED STATES PATENT OFFICE.

PATRICK H. MACK, OF BRADFORD, PENNSYLVANIA.

HOLE-STRAIGHTEN ER.

SPECIFICATION forming part of Letters Patent No. 496,316, dated April25, 1893. i

Application filed May 20, 1892. Serial No. 433.788. (No model.)

of Bradford, county of McKean, and State ofv Pennsylvania, have inventedcertain new and useful Improvements in Hole-Straighteners for Oil andArtesian Vells; and I do hereby declare that the following is a full,clear, and exact description of the same, reference being had to theaccompanying drawings, forming part of this specification, and in which-Figure 1 is a side elevation of my device showing it secured to aportion of the auger stem. Fig. 2 is an axial section of the collar,also an elevation of a portion of the auger stem divided axially in aplane at right angles to the sectional plane of the collar. On thisportion of the auger stem is shown a screwthreaded wedge engaged withthe threads of the collar. Fig. 3 is a plan of my device as shown inFig; 1. In this View are shown semi-circular grooves in the face of thecollar. Fig. 4 is a side elevation of one of the wedges, with the insideor concave face presented. Fig. 5 represents a clamping tool for holdingthe Wedges. Fig. 6 is a view of the hole straightener in use in thewell.

My invention relates to that class of oil well fishing tools, that areused for straightening what are termed by drillers crooked holes.

The object of my invention is to provide an improved hole straightener,that will be simple in construction, effective and reliable when inoperation and that can be easily connected to or disconnected from thedrilling tools by the driller at the well, the auger stem forming a partof this device.

In the drawings-A is a collar, the outside diameter of which is the sizeof the well-hole. The outer face of this collar (see Fig. 3) is providedwith longitudinal grooves D, for the passage of the fluid it displacesin its movements in the well while its inner face is provided withsquare grooves C for the reception of a feather or key M (Figs. 1 and 3)to be referred to hereinafter.

E represents wedges whose concave faces are provided with serrations orscrew-threads to prevent them from slipping on the stem, when in use.

In Fig. 4 a wedge E is shown with a righthand screw-thread on its upperhalf and a left-hand screw-thread on its lower half. This method ofpreparing the concave surface `of the wedges E I prefer because thethreads not only prevent the wedges E from slipping longitudinally, butalso from turning on the auger stem Il, when the collar A, is screwed onor off. The same object can be accomplished, however, by preparing theentire concave face of one of the wedges, with a righthand screw-threadand the entire concave face of the adjoining wedge with a left-handscrew-thread and so continue with the entire set used. The wedges E, areformed at their lower ends, with a smooth outside surface J of lessdiameter thanthe adjoining threaded parts, in order that they may begrasped and held by the clamps K. By so constructing the Wedgesa'shoulder or offset L is formed which rests on the face of the clamp K,and by this means the ends of the screw-threads F, of the several wedgesE when placed in position on the auger stem H, will coincide Wit-h eachother in the same spiral plane, and thereby permit the thread B of thecollarA to engage with them when screwing the collar A on the wedge E. Aset of the wedges E does not form a complete circle around the peripheryof the auger stem H, but a space is left for the insertion of the key M,(see Figs. 1 and 2.)

K, is a clamping tool in the form of a pair of tongs with jaws N and Nmade semi-circular for the purpose of grasping the smooth surfaces J ofthe wedges E on the auger stem H. On the inner periphery of the jaw N isthe projection O, corresponding in width to the key M, and adapted toenter between two of the wedges E, so that when the collar A is screwedover the wedges E, the latter will be held apart at such distance as toallow the key M, to be inserted between them.

For practical use a set of two of my devices is preferably used as shownin Fig. 6, andthe method of using them is as follows: A string ofdrilling-tools being suspended in the derrick with no tool attached tothe auger stem H, the collar A is passed up over the box Q, and heldwhile the auger stem H, which it encircles, is lowered into the well-IOO hole a sufficient distance to bring the upper end of said auger stemon which one of the devices is to be secured, within reach of thedriller. A set of the Wedges E, is then placed on the auger stein H, atthe desired location and clasped by the clamp K, as described above. Thecollar A, is then screwed down over the wedges E with such force as toembed the serrations G, into the auger stem H, while the projection O,keeps the key-space open. The screw-threads B and F, being reasonablyline, the collar A can always be screwed down firmly and yet stopped atsuch a point as to leave one of the several key-seats C, opposite thekey-space ot' the wedges E. This being done, the key M, is inserted andoperates to bind all the parts securely to the auger-stem H. Aftersecuring the collar as described, the auger-stem Il, is raised and asimilar de- Vice is in like manner fastened at its lower end. Around-reamer R is now screwed into the auger-stem box Q, and thehole-straightener is ready for use.

In Fig. 6, S, represents the Well-hole which is shown at thebottom asdeviating from the perpendicular, which is represented by the dottedlines T and U. A crooked hole which is often made in drilling, isgenerally caused by the drilling bit entering a slanting crevice in therock, and starting to drill the hole at an angle. This results inbinding the tools and arresting the progress of the drill. By

my method the collars A, act as guides t-o the drilling tools, centeringand holding the reamer R, in a position perpendicular to the balance ofthe tools, and causing it, as soon as it reaches the point where thewell begins to deviate from the perpendicular, to start a shoulder asshown, and continue cutting in a perpendicular line downward asindicated by the dotted line U, until the bottom of the well-hole isreached. Then the straighteners can be removed, the reamer replaced bythe drilling-bit and the drilling proceeded with.

Having thus described my invention, what I claim is n l. In a wellboring tool the combination of the stern, the interiorly screw-threadedcollar adapted to surround the stem and tit the well hole, the wedgesadapted to tit between the collar and stem and provided with interiorserrations having cutting edges for embedding into the smooth peripheryof the stem at any point to prevent slipping vertically, and a lowercontracted portion having a smooth outer surface for receiving theclamping tool K substantially as set forth.

2. In a well boring tool the combination of the stem, the interiorlyscrew threaded collar adapted to surround the stem and fit the Well holeand the wedges adapted to fit between the collar and stem, exteriorlyscrewthreaded to receive the collar and interorly screw-threaded in twodirections to prevent; slipping circumferentially when the collar isscrewed on and to prevent slipping longitudinally as explained.

PATRlCK H. MACK.

Witnesses:

BEN R. HAGAR, E. C. HnATHcoTE.

